All 47 Coming Soon and Maintenance Mode answers
Answer
Somebody got the announcement twice
They should not, and the plugin is built so they cannot: each address is stamped the moment it is written to, before the attempt, so when a batch dies halfway, the next Send to … not yet emailed carries on from where it stopped.
The one way it happens is Send to everyone again, which is exactly what it says and asks you to confirm.
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